Poppet valve



Juli-10,1930. @.EISSELL. 1,763,340

' POPPET VALVE 4 v Filed July 10, 1926 2 sheets-sneer( 1 June 1o, 1930.vR.; BISSELL `1,763,340

T VALVE Filed July 10, 1926 2 Sheets-Sheet 2 Arron/125K l Paiemeauan@11o, 1930s f rorrn'r `vAnvn Application filed July `1o,

M The invention relates to `poppet valves and, in its most specicfeatures, to what is commonly` called a tulip valv 1 a One object oftheinvention is tomake Mprovision? for "grinding" such valves "whileavoidingconstructions which present sharp points or edges which-tend tocause preignition, especially `in high compression engines. .s

Another object of the invention is to pro-` the power of the engine. l

crease the `tendency to warpage in t tulip valves, and to provide avalve which will run cooler than those heretofore employed. j "'Iheobjects are attained by changing the i formation of the valve heads ofprior constructions as will be hereinafter explained.

For the purpose of exemplifying the prini ciples of my invention, `Idisclose herein f several embodiments of the invention, but l i whichlind their best expression in the tulip i Valve shown inFigure l. j `5"In the annexed drawings:

j Figure 1 is avertical section taken through i 3 a valve constructed inaccordance with my a invention showingthe adjacent parts of the enginestructure, this form being the one now preferred by me.` l i i .Figa2 isa top plan view of the valve. i a ,l Figi?,` is a verticalsection,similar to Fig. l 1, of a modified form. j, j

Figs. 4 and 5 are fragmentary cross-sectional views through the upperedgelof tulip `valves constructed in accordance with the prior art." j iFig. 6;shows the ordinary poppet valve having a curved dome, providedwith a rey"sa vide a `tulip valve head which will increase Other objectsof the invention are to decess in itsupper face having a reentrant`192e. seriaiiro. 121,569;

`to 15 inclusive. my invention it is necessary to consider the action ofexhaust gases g in the process of exhaustion by tulip valves of priorconstruction,` which such valves s has been either fiat, as indicated ata, Fig.

4, or curved,as indicated at b,

Fig. 5. Inthecase of the flat upper edge c1 the gases, on their way `tothe "exit opening past `the valve seat, are directed laterally outwardlyas indicated by arrow 0 and'consequently have `to make a sharp` turnpast the outer edge of accordance;` withvmy invention the upper `Inorder fully to understand are illustrated in Figs. etfand `5. VAsheretofore constructed the upper edge of the valve. In the case of thecurvedupper edge b, a portion of the j f UNETFSTATES PTENTFEQ" RICHARDBissau., oFoLnvELAND HEIGHTS, omdnssreivon To renown-son` Piton.`

edge of the valve is downwardly and outT wardlytinclined toward thevalvefseatpr j i exitlopening, whereby the gases areV given i a singledirection, thus avoidingfa sharp turnat the exitopening, asin theconstrue-i tion shown in Fig.` 4, or theeddy currents which attend` theuse of the construction shownin Fig. 5. j .s i In accordance with `myinvention a valve stem l is provided with ahead 2, having a valveseat 3,anda deep recess 4 in the `upper face; so formed as to provide a rein-`forcing ring 5 at the top and a curved stream line surface 6 joining thevalve seat and the stem;.to this extent the-construction is that oftheprior art 'knownin the.

trade as a tulip valve because of itsre` semblance tothe tulip flower.`But instead offormingthe upper edge of the valve Hat, as in Fig. 4:,.orcurved, asin Fig..5, I give it a downward and outward 1nclination,or

stream line surface,: as indicated at 7 This surface iszpreferably asection of the frus- Vtum of` acone but it may be slightly curved. Theinclination which will give the'best results `will depend upon" theformation of the adjacent walls of the enginecavity in which the valvemay be employed, theextreme range for alltypes of engines to give IUS

